[BBfanUSA]

Here's the full list of 50 acts, panel is the US panel of Cowell, Mandel, Klum, and Mel B with Terry Crews hosting instead of Tyra Banks due to other commitments.

America's Got Talent
Angelica Hale, Singer (Season 12; Runner-Up)
Bianca Ryan, Singer (Season 1; Winner)
Brian Justin Crum, Pop Singer (Season 11; 4th Place)
Courtney Hadwin, Singer (Season 13; Finalist)
Darci Lynne, Singing Ventriloquist (Season 12; Winner)
Drew Lynch, Stand-Up Comedian (Season 10; Runner-Up)
Jackie Evancho, Classical Crossover/Pop Singer (Season 5; Runner-Up)
Jon Dorenbos, Magician (Season 11; 3rd Place)
Kechi, Singer (Season 12; Finalist)
Kenichi Ebina, Dancer (Season 8; Winner)
Paul Zerdin, Ventriloquist (Season 10; Winner)
Piff the Magic Dragon, Comedy Magician (Season 10; Finalist)
Preacher Lawson, Stand-Up Comedian (Season 12; Finalist)
Prince Poppycock, Opera Singer (Season 5; 4th Place)
Ryan Stock and AmberLynn, Sideshow Duo (Season 11; Quarterfinalist)
Sal Valentinetti, Singer (Season 11; 5th Place)
Samuel J. Comroe, Stand-Up Comedian (Season 13; 4th Place)
Sara and Hero, Dog Act (Season 12; 5th Place)
Shin Lim, Magician (Season 13; Winner)
Sofie Dossi, Contortionist (Season 11; Finalist)
Sons of Serendip, Music Group (Season 9)
Taylor Williamson, Stand-Up Comedian (Season 8; Runner-Up)
Tape Face, Mime Act (Season 11; Finalist)
The Texas Tenors, Vocal Trio (Season 4; 4th Place)
The Clairvoyants, Mentalist Duo (Season 11; Runner-Up)
Tom Cotter, Stand-up Comedian (Season 7; Runner-Up)
Uzeyer Novruzov, Ladder Acrobat (Season 10; Finalist)
Vicki Barbolak, Stand-Up Comedian (Season 13; Finalist)
Viktor Kee, Juggler (Season 11; Finalist)

International Got Talents
Attraction, Shadow Dance Group (Britain's Got Talent)
Ashleigh & Sully, Dog Act (Britain's Got Talent; Season 6, Winner as Ashleigh & Pudsey)
Cristina Ramos, Opera/Rock Singer (Spain's Got Talent; Season 1, Winner)
Cosentino, Danger Act (Australia's Got Talent)
Darcy Oake, Magician (Britain’s Got Talent; Season 9; Finalist)
DDF Crew, Jump Roper Dance Crew (Holland's Got Talent; Season 5, Winner)
DJ Arch Jr, DJ (South Africa's Got Talent; Season 6, Winner)
Ksenya Simonova, Sand Artist (Ukraine's Got Talent; Season 1; Winner)
Lost Voice Guy, Stand-Up Comedian (Britain's Got Talent; Season 12; Winner)
Moonlight Brothers, Dance Duo (Denmark's Got Talent; Season 4, Winner)
Paul Potts, Opera Singer (Britain's Got Talent; Season 1; Winner)
Tokio Myers, Multi-instrumentalist (Britain's Got Talent; Season 11; Winner)
Susan Boyle, Opera Singer (Britain's Got Talent; Season 3; Runner-Up)
Justice Crew, Dance Crew (Australia's Got Talent; Season 4; Winner)
Issy Simpson, Magician (Britain's Got Talent; Season 11; Runner-Up)

Multiple Got Talents
Alexandr Magala, Sword Swallower/Acrobat (Season 8; Quarterfinalist: Britain's Got Talent Season 11; Finalist: Russia’s Got Talent; Winner)
Billy & Emily England, Extreme Rollerblade Duo (Season 12; Semifinalist: Britain's Got Talent Season 9; Semifinalist
Colin Cloud , Mentalist (Season 12; Semifinalist Britain's Got Talent Season 6; Judge Cuts)
Deadly Games, Knife Thrower Duo (Season 11; Semfinalist: France Got Talent Season 12; Semifinalist)
Light Balance, Light-Up Dance Crew (Season 12; 3rd Place: Britain's Got Talent Season 8; Semifinalist)
The Professional Regurgitator, Regurgitator (Season 10; 4th Place: France's Got Talent; 4th Place: Britain's Got Talent; Semifinalist)

I still say it's probably Darci Lynn or Shin Lim's show to lose but it's quite star studded